“I wish I knew (the problem),” Granderson said Tuesday. “Because if I knew I would hopefully be able to figure it out. That’s what we’re searching for right now, trying to see exactly what it could, what it might be.”

Earlier this week, the 40-year-old Abreu appeared in his first major league at-bat since 2012. He was called up on Monday.

He was raking at Triple-A Las Vegas, hitting .395 with one home run, four doubles and nine RBIs in 15 games. But the veteran left-handed batter isn’t known for his defense, which could make for an interesting afternoon in blustery Flushing.

Abreu in RF on a windy day in Citi-freaking-Field? Cue up the circus music.

The Mets will be looking for their third win against the Cardinals in the four-game set. Bartolo Colon (1-3, 5.40 ERA) will take the bump against St. Louis’ Lance Lynn (4-0, 3.42 ERA) in the 1:10 p.m. start.